I have a DSL100H, but IMO, all of them are great. The 2000 was built in UK, the H & HR are Vietnam. IMO, the H is built better due to the tube sockets chassis mounted vs PCB mounted. The 2000 has a switch to contour the tone, but the H & HR have the same but on a pot, so more adjustable vs on/off. In general, the 2000 and the H have closer to a classic Marshall tone but more modern vs the HR which has a more modern tone to me than the other 2. Also the HR has a 6 button FS that can control almost everything on the amp. The older 2 have bush buttons to turn crunch on/of, switch between Lead channels, reverb on/off, etc.
Whatever you decide, they are all great amps and have a fantastic price point. I picked up mine used for $250 and it's built like a tank. I also did the C19 mod on mine myself to get the lead channels to sound more like the crunch vs high gain, which is nothing more than clipping the leg on the lead channel bright cap.